#mathematical_relation  a relation between mathematical expressions (such as equality or inequality)
  supertype:  #relation  an abstraction belonging to or characteristic of two entities or parts together
  subtype:  #mathematical_function__function  a mathematical relation such that each element of one set is associated with at least one element of another set
     subtype:  #inverse_function__inversefunction  the function obtained by expressing the dependent variable of one function as the independent variable of another; f and g are inverse functions if f(x)=y and g(y)=x
     subtype:  #Kronecker_delta  a function of two variables i and j that equals 1 when i=j and equals 0 otherwise
     subtype:  #transformation.mathematical_function  a function that changes the position or direction of the axes of a coordinate system
        subtype:  #affine_transformation  a transformation that is a combination of single transformations such as translation or rotation or reflection on an axis
     subtype:  #mapping__map__correspondence  a function such that for every element of one set there is a unique element of another set
     subtype:  #operator  (mathematics) a symbol that represents a function from functions to functions; "the integral operator"
        subtype:  #linear_operator  an operator that obeys the distributive law: A(f+g) = Af + Ag (where f and g are function)
        subtype:  #identity_operator__identity__identity_element  an operator that leaves unchanged the element on which it operates; "the identity under numerical multiplication is 1"
     subtype:  #trigonometric_function__trigonometricfunction__circular_function  function of an angle expressed as a ratio of the sides of right-angled triangle containing the angle
        subtype:  #sine__sin  ratio of the opposite side to the hypotenuse
        subtype:  #cosine__cos__co  ratio of the adjacent side to the hypotenuse
        subtype:  #tangent.trigonometric_function__tan  ratio of the opposite to the adjacent side
        subtype:  #cotangent__cotan  ratio of the adjacent to the opposite side
        subtype:  #sec__secant  ratio of the hypotenuse to the adjacent side
        subtype:  #cosecant__cosec  ratio of the hypotenuse to the opposite side
     subtype:  #threshold_function__thresholdfunction  a function that takes the value 1 if a specified function of the arguments exceeds a given threshold and 0 otherwise
     subtype:  #exponential_function__exponentialfunction__exponential  a function in which an independent variable appears as an exponent
  subtype:  #parity.mathematical_relation  (mathematics) a relation between a pair of integers: if both integers are odd or both are even they have the same parity; if one is odd and the other is even they have different parity

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